Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1992-07-10
1994-01-04
Gellner, Michael L.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181250, 181276, E04F 1704
Patent
active
052762912
ABSTRACT:
A compact resonating muffler is disclosed. Specifically, the muffler is a part of a duct which is preferably rectilinear with an aspect ratio in the order of 3 to 1. The muffler contains at least two and preferably three or more rows or lines of Helmholtz type resonators placed on at least one side of the muffler housing. Preferably, the resonators are on opposite sides of the duct, these sides being opposite major sides when the duct is rectilinear. The first row of the resonators is tuned for attenuation of the major acoustical frequency to be muffled. The second row of the resonators is tuned to exclude the major damped frequency. Preferably, this row of resonators is tuned to harmonics of the major frequency. Finally, the third and last row of resonators is tuned again to muffle the primary frequency, this exact resonant frequency preferably being slightly different from the frequency of the first row of resonators. The entrance to the Helmholtz resonators constitutes elongate openings disposed with their major opening axis length parallel to the direction of fluid flow and at least one and one quarter times their respective minor axis widths. This presents a flow surface with little resistance to the passing flow and resonator opening which do not appreciably degrade the tuned frequency performance of the Helmholtz resonators.
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Dang Khanh
Gellner Michael L.
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